I was camping with a member of the 100K team. It is a beautiful rocket, but this weekend a software bug brought the upper stage back to earth as a supersonic ground-penetrating “bunker buster” that tunneled and blasted a cave 14 feet under ground.

I just posted a video of a supersonic shred on Revver. The rocket screamed to Mach 2 on a L-size motor, and the pressure wave ripped the fins off, making it temporarily unstable (corkscrew). You can hear the warning siren (something I was used to hearing by that point =) and the chatter of people spotting the fins and other chunks as they rained down around us. A classic URD – “Unscheduled Rapid Disassembly”.

Other videos:• A Russian Roar ending with “Remember, mortgage before motors.”

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For the daily blog, see flickr. Or get both with the RSS Feed from FeedburnerWhat is the J-Curve? The IRR curve over time for an early stage VC fund – that period of time in advance of mass-confirmation of a new idea. For fans of Kurzweil's curves and exponentials in general.